cinder service is disabled while backup creation is still successful

[likai]

There is the only cinder-backup service in the environment. After the service is disabled, the backup creation is still successful. The phenomenon is as follows:

step 1: View the list of cinder services:
root@ctl01:~# cinder service-list
+------------------+-------------+------+----------+-------+----------------------------+---------+-----------------+---------------+
| Binary | Host | Zone | Status | State | Updated_at | Cluster | Disabled Reason | Backend State |
+------------------+-------------+------+----------+-------+----------------------------+---------+-----------------+---------------+
| cinder-backup | stor01 | nova | disabled | up | 2021-04-29T10:40:51.000000 | - | - | |
| cinder-scheduler | ctl01 | nova | enabled | up | 2021-04-29T10:40:48.000000 | - | - | |
| cinder-volume | stor01@ceph | nova | enabled | up | 2021-04-29T10:40:53.000000 | - | - | up |
| cinder-volume | stor01@nvme | nova | disabled | down | 2021-03-01T07:13:28.000000 | - | - | - |
+------------------+-------------+------+----------+-------+----------------------------+---------+-----------------+---------------+

step 2： create a backup：
root@ctl01:~# openstack volume backup create 9e3c08d9-3864-4ed5-8be4-ce286dd588b7 --name test
+-------+--------------------------------------+
| Field | Value |
+-------+--------------------------------------+
| id | e262ff1f-fc3c-4eb5-b0be-eafaea2d89ea |
| name | test |
+-------+--------------------------------------+

step 3： View backup details:

root@ctl01:~# openstack volume backup show e262ff1f-fc3c-4eb5-b0be-eafaea2d89ea
+-----------------------+--------------------------------------------+
| Field | Value |
+-----------------------+--------------------------------------------+
| availability_zone | None |
| container | e2/62/e262ff1f-fc3c-4eb5-b0be-eafaea2d89ea |
| created_at | 2021-04-29T10:41:34.000000 |
| data_timestamp | 2021-04-29T10:41:34.000000 |
| description | None |
| fail_reason | None |
| has_dependent_backups | False |
| id | e262ff1f-fc3c-4eb5-b0be-eafaea2d89ea |
| is_incremental | False |
| name | test |
| object_count | 22 |
| size | 1 |
| snapshot_id | None |
| status | available |
| updated_at | 2021-04-29T10:41:39.000000 |
| volume_id | 9e3c08d9-3864-4ed5-8be4-ce286dd588b7 |
+-----------------------+--------------------------------------------+

[Sofia Enriquez (lsofia-enriquez)]

Greetins likai,

- Do you mind sharing the Cinder version you're using?
- Do you mind attaching c-bak logs? Please enable DEBUG=True.
- Do you mind sharing the steps for disable the backup service.

Regards,
Sofia